HydroBASINS lev08 watershed · #2080535760
Bassin du Lignon
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 2 administrative regions : Loire, Puy-de-Dôme
Sub-basin area
691,4km²
Upstream area
691,4km²
Discharge
5,87m³/s
Mean elev.
722m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 691.7 km²99.8% of basin
- 1.4 km²0.2% of basin
69 communes (GADM L5)Available for FRA, RWA
- Saint-Bonnet-le-Courreau50.13 km²99% commune
- Chalmazel38.59 km²98% commune
- Sauvain30.76 km²100% commune
- Saint-Georges-en-Couzan24.18 km²100% commune
- Saint-Didier-sur-Rochefort23.24 km²100% commune
- Roche22.12 km²96% commune
- Noirétable21.84 km²53% commune
- Les Salles21.61 km²83% commune
- Mornand-en-Forez21.45 km²100% commune
- Saint-Just-en-Bas20.57 km²100% commune
- Poncins19.99 km²97% commune
- Savigneux18.59 km²100% commune
- Champdieu18.06 km²100% commune
- Montbrison16.79 km²98% commune
- Montverdun16.73 km²100% commune
- Saint-Jean-la-Vêtre16.66 km²99% commune
- Marcilly-le-Châtel16.44 km²100% commune
- Saint-Laurent-Rochefort15.92 km²100% commune
- Marcoux15.23 km²100% commune
- Essertines-en-Châtelneuf14.79 km²100% commune
- Bard13.80 km²99% commune
- Jeansagnière13.45 km²99% commune
- Saint-Julien-la-Vêtre12.81 km²100% commune
- Saint-Martin-la-Sauveté12.78 km²43% commune
- Saint-Étienne-le-Molard10.66 km²66% commune
- Saint-Paul-d'Uzore9.67 km²100% commune
- Champoly9.31 km²61% commune
- Lérigneux9.31 km²97% commune
- Saint-Sixte9.06 km²59% commune
- Cleppé8.99 km²56% commune
- La Valla-sur-Rochefort8.95 km²100% commune
- La Côte-en-Couzan8.88 km²100% commune
- Châtelneuf8.46 km²100% commune
- Chalain-d'Uzore8.24 km²100% commune
- Trelins8.23 km²100% commune
- Pralong7.91 km²100% commune
- Sail-sous-Couzan7.30 km²100% commune
- Palogneux7.28 km²100% commune
- Saint-Thurin7.03 km²100% commune
- Ailleux6.88 km²77% commune
- Sainte-Foy-Saint-Sulpice6.32 km²22% commune
- Chambéon6.23 km²37% commune
- Sainte-Agathe-la-Bouteresse5.33 km²45% commune
- Écotay-l'Olme5.19 km²86% commune
- Saint-Priest-la-Vêtre5.00 km²100% commune
- Leigneux4.69 km²100% commune
- Verrières-en-Forez4.32 km²21% commune
- Débats-Rivière-d'Orpra3.43 km²100% commune
- Boën2.97 km²51% commune
- Feurs2.81 km²12% commune
- Cervières2.41 km²33% commune
- Saint-Thomas-la-Garde1.90 km²55% commune
- Lézigneux1.82 km²12% commune
- Magneux-Haute-Rive1.28 km²10% commune
- Chalain-le-Comtal1.27 km²7% commune
- Cezay1.08 km²10% commune
- L'Hôpital-sous-Rochefort0.95 km²100% commune
- Grézieux-le-Fromental0.91 km²9% commune
- Précieux0.61 km²4% commune
- Valcivières0.61 km²2% commune
- Job0.40 km²1% commune
- Saint-Anthème0.29 km²0% commune
- La Chamba0.21 km²4% commune
- Saint-Romain-d'Urfé0.11 km²1% commune
- La Chambonie0.11 km²2% commune
- Le Brugeron0.10 km²0% commune
- Civens0.03 km²0% commune
- Mizérieux0.01 km²0% commune
- Saint-Romain-le-Puy0.00 km²0% commune
12 intersecting protected areas
Livradois-Forez
IUCN VRegional Nature Park
188.09 km² overlap
Plaine du Forez
IUCN Not ReportedSpecial Protection Area (Birds Directive)
100.18 km² overlap
Parties sommitales du Forez et hautes chaumes
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
57.47 km² overlap
Lignon, Vizezy, Anzon et leurs affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
23.75 km² overlap
Jasseries De Colleigne
IUCN IVRegional Nature Reserve
2.81 km² overlap
Monts du Forez
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.16 km² overlap
Milieux alluviaux et aquatiques de la Loire
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.22 km² overlap
Etangs du Forez
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.11 km² overlap
Bois-Noirs
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.06 km² overlap
3 more protected areassorted by overlap area
Land acquired by a regional conservatory of natural areas
0.03 km² overlap
mont semiol
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
Land acquired by a regional conservatory of natural areas
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 074 distinct species · 285 706 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin du Lignon : 29 espèces + 5 bulles famille, 51 interactions GloBI documentées sur 7 types (connectance 9.1%, filtre Serrano α=0.2). Les 5 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
8,8°C
Annual rain
786mm
Moisture idx (CMI)
-0,04
Runoff
272mm/an
PET
821mm
AET
626mm
Mean slope
7,5°
Water table
390cm
Forest
55%
Crops
34%
Urban
3%
Protected
7%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)